Commutator.



E. MATTMAN.

GOMMUTATOR.

APPLIOATION FILM) AUG. 6, 1909.

Patented May 16, E911.

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EMIL MATTMAN, OF MILWAUKEE, WISCONSIN, ASSIGNOR TO. ALLIS-CHALMERS COMPANY, A CORPORATION OF NEW JERSEY.

COMMUTATOR.

Specification of Letters Patent.

Patented May 1e, 1911.

Application filed August 6, 1909. Seriall No. 511,493.

To all 'whom 'it may concern:

Be it known that 1, EMIL MAT'rMAm a citizen ot' Switzerland, residingyat Milwain lree, in the county of Milwaukee and State of `Wisconsin, have invented certain new and useful Improvements in Commutators, oi which the following is a full, clear, and exact specification.

My invention relates to the construction of commutators for dynamo-electric machines.y

One of the objects of my invention is to improve means for retaining insulation used shaft 10 has been shown upon which is mounted a spider 11 comprising two annular interchangeable members 12 having enlarged portions 13 for centering and supporting a commutator 14, which includes a plurality ot bars. These annular members 1Q are provided witli projections or undercut portions 15, preferably/.integral and extending in wardly relative to the commutator, forming` recesses 16 for the reception of insulation 17 which is interposed between the spider and thecoinmutator bars. Then the ends ot' the insulation 17 are placedin the recesses 16 it is impossible for said insulation to be thrown lout by the action of centrifugal or other forces. By means oty usingthe projections 1 5 for retaining the insulation 17 in position, the use of cordingis obviated.

A member 18, preferably formed oi'l sheet metal, is secured to the annular members 12 by bolts 19 which engage the threaded portions of tapped holes 20. This cylindrical member 18 forms a. shell passing` completely around the inner part of the spider and prevents any dust 'or other inJurious matter from coming in Contact with the under side of the commutator bars which might cause a short circuit. The shell is further provided with slots 21 to allow for the shitting of the shell if desired. The two annular members are held together by bolts 22 and may be drawn up to any desirable degrees of tightness by nuts 23 which engage the threaded portions Q4 of the bolts 22. spider can be used tor supporting-and centering a commutator of any desired lengt-h. The shell 18 also serves as added stitlening means for the light|` and comparatively inexpensive structure. The internal structure of the commutator is open, thus allowing for the passage of currents of air forl coolingA purposes. y

There may be many modifications in the precise arrangement herein shown and de.; scribed and Iaim in my claims t0 cover all-v such modifications which do notdepart from the. spirit and scope ot my invention.

What 1 claim as new is 1. Acominutator comprising a plurality of bars, a spider for supporting said bars,

and a member provided with slots and secured to said spider to prevent in]ui'1ous mat-ter from coming 1n contact with ,said

bars, said slots arranged to permit axial shifting of said member.

2. A commutator comprising a plurality of bars, a spider *supporting said bars a This soy

member adapted to prevent" injurious matter secured to said spider to prevent injurious matter from coming in Contact with said bars,i said slots arranged 'to-permit shifting of said member.

1n testimony whereof l aiiix my signature,

in the prese-nce of two' witnesses.

EMIL MATTMAN. lvitnesses:

Criss. L. Bramav ROB. E. Brom.. 

